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MAX1910

Maxim
Part Number MAX1910
Manufacturer Maxim
Description 1.5x/2x High-Efficiency White LED Charge Pumps
Published May 6, 2005
Detailed Description 19-2290; Rev 2; 3/04 1.5x/2x High-Efficiency White LED Charge Pumps General Description The MAX1910/MAX1912 power LEDs ...
Datasheet PDF File MAX1910 PDF File

MAX1910
MAX1910

Overview
19-2290; Rev 2; 3/04 1.
5x/2x High-Efficiency White LED Charge Pumps General Description The MAX1910/MAX1912 power LEDs with a regulated output voltage or current (up to 120mA) from an unregulated input supply (2.
7V to 5.
3V).
These are complete DC-DC converters requiring only four small ceramic capacitors and no inductors.
Input ripple is minimized by a unique regulation scheme that maintains a fixed 750kHz switching frequency over a wide load range.
Also included are logic-level shutdown and soft-start to reduce input current surges at startup.
The MAX1910 has two automatically selected operating modes: 1.
5x and 2x.
1.
5x mode improves efficiency at higher input voltages, while 2x mode maintains regulation at lower input voltages.
The MAX1912 operates only in 1.
5x mode.
The MAX1910 and the MAX1912 are available in a space-saving 10-pin µMAX package.
Features ♦ High-Efficiency 1.
5x/2x Charge Pumps ♦ Low Input Ripple with 750kHz Operation ♦ 200mV Current-Sense Threshold Reduces Power Loss ♦ Current- or Voltage-Regulated Charge Pump ♦ Up to 120mA Output Current ♦ No Inductors Required ♦ Small Ceramic Capacitors ♦ Regulated ±5% LED Current ♦ Load Disconnected in Shutdown ♦ 1µA Shutdown Current ♦ Small 10-Pin µMAX Package MAX1910/MAX1912 Applications White LED Backlighting Cellular Phones PDAs Digital Still Cameras MP3 Players Backup-Battery Boost Converters PART MAX1910EUB MAX1912EUB Ordering Information TEMP RANGE -40°C to +85°C -40°C to +85°C PIN-PACKAGE 10 µMAX 10 µMAX Typical Operating Circuit TOP VIEW VIN IN1 C1+ C1 CIN C1C2+ C2 C2GND IN2 SHDN OUT Pin Configuration GND 1 IN1 C22 3 4 5 10 SET 9 C1IN2 C2+ SHDN MAX1910 MAX1912 8 7 6 MAX1910 MAX1912 SET COUT C1+ OUT µMAX ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.
maxim-ic.
com.
1.
5x/2x High-Efficiency White LED Charge P...


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